Implement confirm bubble for Mac.

chrome/chrome_browser.gypi

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2581 matching lines @@
         'browser/ui/cocoa/bubble_view.mm',
         'browser/ui/cocoa/certificate_viewer.mm',
         'browser/ui/cocoa/chrome_browser_window.h',
         'browser/ui/cocoa/chrome_browser_window.mm',
         'browser/ui/cocoa/chrome_event_processing_window.h',
         'browser/ui/cocoa/chrome_event_processing_window.mm',
         'browser/ui/cocoa/clickhold_button_cell.h',
         'browser/ui/cocoa/clickhold_button_cell.mm',
         'browser/ui/cocoa/command_observer_bridge.h',
         'browser/ui/cocoa/command_observer_bridge.mm',
+        'browser/ui/cocoa/confirm_bubble_controller.h',
+        'browser/ui/cocoa/confirm_bubble_controller.mm',
+        'browser/ui/cocoa/confirm_bubble_view.h',
+        'browser/ui/cocoa/confirm_bubble_view.mm',
         'browser/ui/cocoa/confirm_quit_panel_controller.h',
         'browser/ui/cocoa/confirm_quit_panel_controller.mm',
         'browser/ui/cocoa/constrained_html_delegate_mac.mm',
         'browser/ui/cocoa/constrained_window_mac.h',
         'browser/ui/cocoa/constrained_window_mac.mm',
         'browser/ui/cocoa/content_settings/collected_cookies_mac.h',
         'browser/ui/cocoa/content_settings/collected_cookies_mac.mm',
         'browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.h',
         'browser/ui/cocoa/content_settings/content_setting_bubble_cocoa.mm',
         'browser/ui/cocoa/content_settings/cookie_details.h',
@@ skipping 2817 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }